Figure 4. East-west migrated multichannel seismic reflection profile Lusigal-12 through Sites IBERIA08A, IBERIA09A/B, 900, and 901 (Fig. 1). The lower profile is an interpretation of basement reflections seen in the upper profile. Synrift I sediments are marked by close diagonal ruling; synrift II sediments are marked by coarse ruling. H is a detachment fault controlling extension during synrift I phase; L is a listric fault active during the synrift II phase. Pre-rift units are probably present in fault block FB, but are not identified. The magnetic anomaly profile (top) was computed from the data set used to produce the magnetic anomaly chart in Figure 3.
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